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  <title>Document</title>
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  <h2>绝对路径</h2>
  <a href="http://atguigu.com/search?keyword=html5">尚硅谷</a>
  <a href="/search?keyword=htm">搜索</a>

  <h2>相对路径</h2>
  <a href="./css/app.css"> CSS </a>
  <a href="css/app.css"> CSS </a>
  <a href="../js/app.js"> JS </a>

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